Git Sagar
f586fa8b6a
Set LIBGUESTFS_PATH so virt-customize uses the nixpkgs pre-built appliance instead of building one at runtime. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
60 lines
2.4 KiB
Nix
60 lines
2.4 KiB
Nix
# wrapper function around virt-customize to create custom Linux image from an original OS image
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{ pkgs, lib, ... }:
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originalImage: {
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name ? "",
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hostname ? "",
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nameToHostname ? true,
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diskSize ? "",
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smp ? 2,
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memSize ? 1024,
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install ? [],
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run ? "",
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commands ? "",
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debug ? false,
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impure ? true,
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# Linux-only: script to run on first boot (via systemd --firstboot)
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firstboot ? ""
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}:
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let
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originalImageName = lib.strings.removeSuffix "-vmix" (lib.strings.removeSuffix ".qcow2" originalImage.name);
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customImageName = (if name != "" then name else "custom") + "-${originalImageName}-vmix.qcow2";
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resultImg = "./disk.qcow2";
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setHostname = if hostname != "" then hostname else if nameToHostname then name else "";
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virtCustomizeArgsHostname = if setHostname != "" then "--hostname '${setHostname}'" else "";
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virtCustomizeArgsInstall = if install != [] then "--install '${lib.strings.concatStringsSep "," install }'" else "";
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virtCustomizeArgsCommandsFile = if commands != "" then ("--commands-from-file " + pkgs.writeText "${name}-virt-customize-commands-file" commands) else "";
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virtCustomizeArgsRun = if run != "" then ("--run " + pkgs.writeScript "${name}-virt-customize-run-script" "${run}") else "";
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virtCustomizeArgsFirstboot = lib.optionalString (firstboot != "")
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("--firstboot " + pkgs.writeScript "${name}-firstboot" firstboot);
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builderCommand = ''
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export PATH="${pkgs.qemu}/bin:${pkgs.curl}/bin:$PATH"
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# create resulting image backed by original image
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qemu-img create -f qcow2 -b ${originalImage} -F qcow2 ${resultImg}
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[ -n "${diskSize}" ] && qemu-img resize ${resultImg} ${diskSize}
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# run script inside image using virt-customize
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export LIBGUESTFS_PATH="${pkgs.libguestfs-with-appliance}/lib/guestfs"
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export LIBGUESTFS_APPEND="ipv6.disable=1"
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${pkgs.guestfs-tools}/bin/virt-customize \
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${lib.optionalString debug "-v"} \
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-a ${resultImg} \
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--smp ${builtins.toString smp} \
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--memsize ${builtins.toString memSize} \
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${virtCustomizeArgsHostname} \
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${virtCustomizeArgsInstall} \
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${virtCustomizeArgsFirstboot} \
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${virtCustomizeArgsCommandsFile} \
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${virtCustomizeArgsRun}
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mv ${resultImg} $out
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'';
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builtImage = pkgs.runCommand customImageName (lib.optionalAttrs impure { __noChroot = true; }) builderCommand;
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in
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builtImage // { _vmixOsType = "linux"; }
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